//
//  WelcomeViewController.swift
//  HJWeibo
//
//  Created by mac on 16/1/15.
//  Copyright © 2016年 mac. All rights reserved.
//

import UIKit
import SnapKit
import SDWebImage



class WelcomeViewController: UIViewController {
    
    override func loadView() {
        view = backImageView
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        //添加子视图
        setupUI()
        
        //showAnimation()
    }
    
    //动画效果不推荐在 viewDidLoad/loadView 中执行
    //推荐在 ViewDidAppear中执行动画效果
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        //执行动画
        showAnimation()
    }
    

   
    
    
    
    //添加子视图
    private func setupUI() {
        
        self.view.addSubview(headImageView)
        self.view.addSubview(welcomeLabel)
        //设置约束
        headImageView.snp_makeConstraints { (make) -> Void in
            make.bottom.equalTo(self.view.snp_bottom).offset(-160)
            make.centerX.equalTo(self.view.snp_centerX)
            make.size.equalTo(CGSize(width: 90, height: 90))
        
        }
        welcomeLabel.snp_makeConstraints { (make) -> Void in
            
            make.top.equalTo(headImageView.snp_bottom).offset(12)
            
            make.centerX.equalTo(headImageView.snp_centerX)
           
        }
        //头像的圆角设置
        headImageView.layer.cornerRadius = 45
        headImageView.layer.masksToBounds = true
        
        //隐藏文案  (<0.1)
        welcomeLabel.alpha = 0.09
        
        //显示用户头像
        headImageView.sd_setImageWithURL(HJUserAccountViewModel().headImageURL, placeholderImage: UIImage(named: "avatar_default_big"))
    }
    
    //MARK: 显示动画效果
    private func showAnimation() {
        //在动画闭包中修改 头像的底部约束
        //snp_updateConstraints:更新某一条已经添加的约束 如果该约束不存在，会自动添加该约束
        //usingSpringWithDamping:弹簧系数 ）0.1 ~1 越小，越弹
        //initialSpringVelocity: 加速度
        //options:动画可选项 OC按位枚举 swift:数组
        //弹簧系数设置准则 （弹簧系数 *10 ~=加速度）
        
        //使用自动布局 ＋ 动画闭包 ===> 强制刷新视图
        
        let offset = -UIScreen.mainScreen().bounds.height + 160
        //效果一样
//        self.headImageView.snp_updateConstraints { (make) -> Void in
//            make.bottom.equalTo(self.view.snp_bottom).offset(offset)
//        }
        UIView.animateWithDuration(1.5, delay: 0.5, usingSpringWithDamping: 0.98, initialSpringVelocity: 9.8, options: [], animations: { () -> Void in
            self.headImageView.snp_updateConstraints { (make) -> Void in
                make.bottom.equalTo(self.view.snp_bottom).offset(offset)
            }
            self.view.layoutIfNeeded()
            }) { (_) -> Void in
                //显示文案
                UIView.animateWithDuration(0.6, animations: { () -> Void in
                    self.welcomeLabel.alpha = 1.0
                    }, completion: { (_) -> Void in
                        print("OK")
                        
                        //发出显示首页的通知
                        NSNotificationCenter.defaultCenter().postNotificationName(WBSwitchRootVC, object: nil)
                        print("shouye")
                        
                })
                
                
                
        }
     
        
    
     
        
    }
    

    //懒加载子视图
    private lazy var backImageView: UIImageView = UIImageView(image: UIImage(named: "ad_background"))
    
    //用户头像
    private lazy var headImageView: UIImageView = UIImageView(image: UIImage(named: ""))
    
    private lazy var welcomeLabel: UILabel = {
        
        let l = UILabel()
        l.text = (HJUserAccountViewModel().userName ?? "") + "欢迎 回来"
        l.textColor = UIColor.darkGrayColor()
        l.font = UIFont.systemFontOfSize(18)
        
        //设置大小
        l.sizeToFit()
        
        return l
    }()
    
    
    
    
    
}
